Drug interactions
Flecainide + Ziprasidone
Severity: Major
Flecainide and Ziprasidone: major interaction.
Last updated Sources: UK SmPC
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs can prolong the QT interval and slow cardiac conduction. Combined use raises the risk of ventricular arrhythmias including torsades de pointes, especially with electrolyte disturbances or structural heart disease. Ziprasidone is generally avoided with other QT-prolonging antiarrhythmics.
What this interaction means in plain words
Flecainide and Ziprasidone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Flecainide belongs to Cardiovascular; Ziprasidone belongs to Central Nervous System.
Why it happens
Additive pharmacodynamic effects on cardiac repolarization and conduction.
What to do
Avoid the combination where possible and choose an alternative antipsychotic with lower QT liability. If unavoidable, obtain a baseline and follow-up ECG and correct potassium and magnesium.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Flecainide
- Flecainide + Nirmatrelvir Contraindicated
- Flecainide + Nirmatrelvir / ritonavir Contraindicated
- Flecainide + Pimozide Contraindicated
- Flecainide + Ritonavir Contraindicated
- Flecainide + Thioridazine Contraindicated
- Flecainide + Tipranavir Contraindicated
Other interactions of Ziprasidone
- Amiodarone + Ziprasidone Contraindicated
- Amitriptyline + Ziprasidone Contraindicated
- Arsenic trioxide + Ziprasidone Contraindicated
- Bedaquiline + Ziprasidone Contraindicated
- Chloroquine + Ziprasidone Contraindicated
- Citalopram + Ziprasidone Contraindicated
Frequently asked questions
Can I take Flecainide with Ziprasidone?
MediHelp rates the interaction as major. Flecainide and Ziprasidone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both drugs can prolong the QT interval and slow cardiac conduction. Combined use raises the risk of ventricular arrhythmias including torsades de pointes, especially with electrolyte disturbances or structural heart disease. Ziprasidone is generally avoided with other QT-prolonging antiarrhythmics.
How serious is the interaction between Flecainide and Ziprasidone?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible and choose an alternative antipsychotic with lower QT liability. If unavoidable, obtain a baseline and follow-up ECG and correct potassium and magnesium.
What other medicines interact with Flecainide?
MediHelp also lists interactions of Flecainide with, for example, Nirmatrelvir, Nirmatrelvir / ritonavir, Pimozide. The full list is on the Flecainide page.
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